fix ContentLengthMiddleware(..., maxstore=()) on Py3k

On Python 2.x, any integer sorts below the empty tuple. That was
exploited in the maxstore parameter, but fails on Python 3 with a
TypeError.

Also add a regression test.

Reported-by: Dominik Brodowski <mail@dominikbrodowski.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/wsgitools/middlewares.py b/wsgitools/middlewares.py
index b37b130..97b8092 100644
--- a/wsgitools/middlewares.py
+++ b/wsgitools/middlewares.py
@@ -137,6 +137,8 @@ class ContentLengthMiddleware(object):
                wsgi standard
         """
         self.app = app
+        if maxstore == ():
+            maxstore = float("inf")
         self.maxstore = maxstore
     def __call__(self, environ, start_response):
         """wsgi interface"""